<?php 
if(!isset($tempFamilyStatus))
  $tempFamilyStatus = isset($_POST['familyStatus']) ? $_POST['familyStatus'] : null;
?>
<select name="familyStatus">
  <option value="-1">--</option>
  <option value="1" <?php echo ($tempFamilyStatus == 1) ? 'selected="selected"' : null;?>>В браке</option>
  <option value="2" <?php echo ($tempFamilyStatus == 2) ? 'selected="selected"' : null;?>>Длительные отношения</option>
  <option value="3" <?php echo ($tempFamilyStatus == 3) ? 'selected="selected"' : null;?>>Свободен</option>
</select>